Nils Kasseckert
Go Generics
#1about 1 minute
Understanding the basics of generic programming in Go
Generic programming allows you to write type-independent code, which was introduced in Go 1.18 with type parameters, type sets, and type inference.
#2about 4 minutes
Using type parameters to write type-independent functions
Type parameters, declared in square brackets, allow a single function to operate on multiple numeric types, eliminating code duplication.
#3about 1 minute
Simplifying functions with predefined type constraints
Go provides built-in constraints like `constraints.Integer` and `constraints.Float` to easily define what types a generic function can accept.
#4about 5 minutes
Defining custom type constraints using interfaces and typesets
Interfaces now define a set of types, not just methods, and the tilde (~) operator can be used to include a type's underlying types in a constraint.
#5about 3 minutes
Nesting and simplifying constraints with the 'any' keyword
Type constraints can be restricted by other constraints, and the `any` keyword serves as a convenient alias for an empty interface to simplify declarations.
#6about 6 minutes
How Go uses function argument and constraint type inference
The compiler can infer type arguments from function parameters, but they must be specified explicitly for types used only in return values.
#7about 3 minutes
A practical example of loading YAML files with generics
A generic function can load YAML data into any struct, but using the `any` constraint sacrifices compile-time type safety.
#8about 1 minute
Using marker interfaces to enforce type safety with generics
A marker interface with a unique method can be used as a type constraint to ensure only intended structs are passed to a generic function.
#9about 1 minute
Key takeaways and summary of Go generics
Generics in Go 1.18 use type parameters and constraints to create flexible functions, supported by type inference to simplify calls.
#10about 1 minute
Q&A: The trade-offs of losing type safety
Using generics without proper constraints can lead to a loss of type safety, but the benefit is often less and more readable code.
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